That can't be the whole story.
If we assume the drive can write 500MB/s (conservative), and an OS install takes up 50GB of space (conservative), it should take less than 2 minutes to write the partition. Where does the other 58 minutes go?
If we assume the drive can write 500MB/s (conservative), and an OS install takes up 50GB of space (conservative), it should take less than 2 minutes to write the partition. Where does the other 58 minutes go?
My guess is that nobody really took the time to optimize it. Installation is only one-time procedure and even it if takes a hour, who cares.
As for Debian, the slowness comes mostly for fsync calls I think. You should be able to use eatmydata to avoid this. See: https://people.skolelinux.org/pere/blog/Quicker_Debian_insta...
Presumably, you're experiencing the same download issues my work MBP is experiencing. It's been downloading for over an hour and is just barely past 50%. My Internet bandwidth is 10G real-world and un-busy, so presumably Apple's CDN is getting hit good.